[YUNIKORN-1601] Shim: Implement preemption predicate handling

[craigcondit]

What is this PR for?

Add PreemptionPredicates() RM callback implementation to support preemption in core.

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-1601

How should this be tested?

Manually verified that algorithm functions when combined with apache/yunikorn-core#511.
Basic unit tests.
Will add e2e tests once the core implementation is finalized.

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

Merging #542 (1e8e4d2) into master (9389241) will decrease coverage by 0.32%.
The diff coverage is 34.28%.

@@            Coverage Diff             @@
##           master     #542      +/-   ##
==========================================
- Coverage   69.56%   69.24%   -0.32%     
==========================================
  Files          45       45              
  Lines        7731     7801      +70     
==========================================
+ Hits         5378     5402      +24     
- Misses       2156     2199      +43     
- Partials      197      200       +3     

Impacted Files	Coverage Δ
pkg/cache/context.go	41.06% <0.00%> (-1.36%)	⬇️
pkg/plugin/predicates/predicate_manager.go	51.42% <55.81%> (+0.69%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pbacsko]

Need unit test for IsPodFitNodeViaPreemption().

[craigcondit]

Need unit test for IsPodFitNodeViaPreemption().

Again, same as above, this would require mocking out a substantial amount of the underlying code, which doesn't really verify that it works properly. As with IsPodFitNode() (which this mirrors) we will test this primarily with e2e tests.

[pbacsko]

Questioms, concerns have been addressed.

+1 LGTM